Three statements are given, followed by four conclusions numbered I, II, III and IV. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.

Statements:

No table is bed.

No bed is door.

All doors are chairs.

Conclusions:

I. No door is table.

II. No chair is bed.

III. No chair is table.

IV. All chairs are door.